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1. Cold water activates it fastest
Splashing cold water on your face (especially around the eyes and nose) triggers the reflex more strongly than warm water.

2. Hold your breath + face immersion = strongest effect
The reflex works best when you combine breath-holding with putting your face in water—not just one or the other.

3. It slows your heart rate
The reflex naturally reduces heart rate to conserve oxygen, which is why it’s sometimes used in calming techniques or to interrupt anxiety spikes.